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National Drinking Water Database


Dichloromethane (methylene chloride) in California


Dichloromethane is a widely-used paint remover, solvent and metal degreasing agent; it is discharged into the environment from the manufacture of chemicals, textiles, electronics, metals and plastics, pharmaceuticals and pesticides. [read more]

The Most Polluted Communities in California

72 water utilities reported detecting Dichloromethane (methylene chloride) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Dichloromethane (methylene chloride) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Mettler County Water District
Bakersfield, CA
1461 of 110 ppb
(10 ppb)
2St. Clair Ranchos Mutual Water Co.
Bakersfield, CA
681 of 12.2 ppb
(2.2 ppb)
3Paradise Ranch Mhp C/O Santiago Assoc.
Castaic, CA
2041 of 32 ppb
(0 to 6 ppb)
4Del Rey Community Serv Dist
Del Rey, CA
9501 of 21.63 ppb
(0 to 3.26 ppb)
5Seventh Standard Mutual
Bakersfield, CA
601 of 21.35 ppb
(0 to 2.7 ppb)
6Guatay Mutual Benefit Corporation
Guatay, CA
1001 of 10.91 ppb
(0.91 ppb)
7Volcano Community Service Dist
Volcano, CA
1601 of 30.73 ppb
(0 to 2.2 ppb)
8R-Wild Horse Ranch
Platina, CA
5001 of 20.68 ppb
(0 to 1.35 ppb)
9City of Red Bluff
Red Bluff, CA
12,9831 of 30.66 ppb
(0 to 1.97 ppb)
10Rose Villa Apartments
Rosamond, CA
1001 of 20.65 ppb
(0 to 1.3 ppb)

Health Based Limits for Dichloromethane (methylene chloride)

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.0 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.4 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.4.6 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.5 ppb
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.5 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.500 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.2000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.2000 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.10000 ppb

Violation Summary for Dichloromethane (methylene chloride) in California

There are no violations reported for this contaminant in California